CN112848285A - 3D printing powder cleaning chain and powder cleaning method - Google Patents
3D printing powder cleaning chain and powder cleaning method Download PDFInfo
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- CN112848285A CN112848285A CN202011489849.1A CN202011489849A CN112848285A CN 112848285 A CN112848285 A CN 112848285A CN 202011489849 A CN202011489849 A CN 202011489849A CN 112848285 A CN112848285 A CN 112848285A
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- Prior art keywords
- chain
- powder
- product
- powder cleaning
- printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/35—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention belongs to the technical field of 3D printing, and particularly relates to a 3D printing powder cleaning chain and a powder cleaning method. The powder cleaning method is characterized in that at least one chain is arranged in the SLS printing product, and the chain is pulled to loosen powder in the product during powder cleaning. The powder cleaning method provided by the invention provides a brand new thought for SLS post-treatment, can quickly and efficiently clean the raw material powder in the product, especially for semi-closed products, even products with complex structures inside, can quickly loosen slightly-agglomerated powder inside the product to realize efficient and rapid powder cleaning, effectively makes up the defects of the traditional air blowing powder cleaning, and further expands the product range applicable to SLS printing technology. Such post-processing methods will help to promote large-scale industrial application of 3D printing technology today where 3D printing technology does not yet replace traditional manufacturing conditions.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and particularly relates to a 3D printing powder cleaning chain and a powder cleaning method.
Background
The selective laser sintering rapid prototyping (SLS) technique slices the three-dimensional model according to a certain thickness by means of computer-aided design and manufacturing to obtain a sliced interface profile. The laser beam is then controlled to scan the powder over the solid portion of the mould, causing the powder particles to melt and adhere to each other, gradually giving the contour of the layer. And finally obtaining a semi-finished product by adopting a layered manufacturing and stacking principle. The semi-finished product after SLS part forming still needs to be subjected to a post-processing step of powder cleaning, and when the semi-closed product with only one or a plurality of small openings is encountered, the powder retained in the cavity is extremely difficult to clean, and the powder cleaning efficiency is extremely low. However, the current research on the method of laser sintering post-treatment is relatively deficient.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a 3D printing powder cleaning chain and a powder cleaning method.
The powder cleaning method is characterized in that at least one chain is arranged in the SLS printing product, and the chain is pulled to loosen powder in the product during powder cleaning. The powder cleaning method provided by the invention provides a brand new thought for SLS post-treatment, can quickly and efficiently clean the raw material powder in the product, and particularly can quickly loosen the slightly agglomerated powder in the product to realize efficient and rapid powder cleaning for a closed or semi-closed product, even a product with a complex structure in the product.
Preferably, the chain is printed at the same time the SLS prints the product. The mode can print the chain with any shape, is suitable for a very complicated inner cavity structure and hardly consumes additional time.
Preferably, the chain is not connected to the product.
Furthermore, a cavity is formed in the product, at least one opening is formed in the cavity, and at least one end of the chain is exposed out of the opening. In the same product, one or more chains can be arranged according to different cavity structures, so that powder can be removed from each part.
Further, the chain is obtained by connecting continuous chain units, and the adjacent chain units are in point connection, line connection or surface connection.
According to the invention, a series of chains with excellent performance are specifically designed and optimized, and respective characteristics of the chains are researched and summarized, so that the chains can be reasonably selected or combined for use according to actual needs. Fig. 1 and 6 show a chain 1, fig. 2 and 7 show a chain 2, fig. 3 and 8 show a chain 3, fig. 4 and 9 show a chain 4, and fig. 5 and 10 show a chain 5. The tensile properties of the chain were tested after printing with nylon material at a 2mm frame diameter and the results are shown in table 1.
TABLE 1
| Experimental group | Chain 1 | Chain 2 | Chain 3 | Chain 4 | Chain 5 |
| Tensile Strength (MPa) | 14.4 | 9.6 | 15.7 | 17.1 | 9.1 |
In the chain, the tensile strength of the chain 1, 3 and 4 is high, and the chain units of the chain 1, 2 and 5 are connected through a single point or multiple points, so that the bending performance is excellent.
Taking the chain 1 as an example, the chain unit is a regular octahedron skeleton, eight faces are congruent regular triangles, and adjacent regular octahedron skeletons are connected by points. Through experimental tests, the chain has high tensile strength and good bending performance, is not easy to break during powder cleaning, and is not easy to be clamped inside a product.
Taking the chain 4 as an example, the chain units are rhombic dodecahedrons, twelve surfaces are congruent rhombuses, and adjacent rhombic dodecahedrons are connected by surfaces. Through experimental tests, the chain has very high tensile strength and excellent powder cleaning effect.
Furthermore, chain powder cleaning is combined with air gun blowing powder cleaning to form complementation, and a better powder cleaning effect can be obtained.
Has the advantages that:
(1) under the condition that does not influence the original structural design of product, add inside clear powder chain structure, clear powder through the method of pulling the chain, not only greatly promoted the clear powder efficiency of product, but also can enlarge the product application scope that the SLS printed, can print some products that can't print the production because of clear powder difficulty.
(2) The invention also provides a series of powder cleaning chain structures with respective characteristics, and when products with complex structures are produced, the internal structures of the products can be analyzed, and chain customized arrangement and combination can be carried out, so that the powder cleaning is achieved to the maximum extent.
Drawings
Fig. 1 to 5 are actual views of the chain of the present invention.
Fig. 6 to 10 are schematic structural views of the chain unit of the present invention.
FIG. 11 is a schematic representation of the dusting of example 1.
FIG. 12 is a schematic representation of the dusting of example 2.
FIG. 13 is a schematic representation of the dusting of example 3.
Detailed Description
The invention is further illustrated by the following specific examples, which are illustrative and intended to illustrate the problem and explain the invention, but not limiting.
Example 1
A3D printing powder cleaning chain and a powder cleaning method.
(1) In the target product shown in fig. 11, a suitable chain structure is designed by using three-dimensional software, the target product in this embodiment is a shell with two ports, two chains are arranged in the product, and the designed structure model is led into a 3D printer to be printed.
(2) The 3D printer adopts the SLS selectivity laser sintering printer.
(3) The 3D of this box prints and utilizes SLS selectivity laser sintering technique, and the printing raw materials adopts the nylon powder, utilizes the laser instrument to carry out successive layer scanning irradiation to the powder under the control of computer, realizes the sintering bonding of thermoplastic powder, piles up layer upon layer and realizes the shaping.
(4) The nylon powder adopted by the 3D printing semi-closed box structure is powder with the grain size of hundred microns, and the sintering and forming temperature of the thermoplastic material is 170 ℃.
(5) And taking the product out of the printer, and removing powder on the surface of the product.
(6) The chain that prints inside the box slowly stimulates, draws loose the inside powder that condenses into the fritter because of high temperature of box, and the clearance is simultaneously promoted chain structure to combine traditional clear powder methods such as air gun, clear out inside residual powder totally.
Example 2
A3D printing powder cleaning chain and a powder cleaning method.
(1) An appropriate chain structure is designed in the three-dimensional software of the target product shown in fig. 12, and the designed structural type is imported into a 3D printer for printing.
(2) The 3D printer adopts the SLS selectivity laser sintering printer.
(3) This spheroidal 3D prints and utilizes SLS selectivity laser sintering technique, and the printing raw materials adopts PP powder, utilizes the laser instrument to carry out successive layer scanning irradiation to the powder under the control of computer, realizes the sintering bonding of thermoplastic powder, piles up layer upon layer and realizes the shaping.
(4) The PP powder adopted by the 3D printing spherical structure is powder with the grain size of hundred microns, and the sintering and forming temperature of the thermoplastic material is 120 ℃.
(5) And taking the product out of the printer, and removing powder on the surface of the product.
(6) The chain that prints inside the spheroid slowly stimulates, draws loose the inside powder that condenses into the fritter because of high temperature of box, and the clearance is simultaneously promoted chain structure to combine traditional clear powder methods such as air gun, clear out inside residual powder is whole.
Example 3
A3D printing powder cleaning chain and a powder cleaning method.
(1) Firstly, a proper chain structure is designed in the three-dimensional software of the target product shown in fig. 13, and the designed structural type is led into a 3D printer to be printed.
(2) The 3D printer adopts the SLS selectivity laser sintering printer.
(3) The 3D of this bottle prints and utilizes SLS selectivity laser sintering technique, and the printing raw materials adopts the TPU powder, utilizes the laser instrument to carry out successive layer scanning irradiation to the powder under the control of computer, realizes the sintering bonding of thermoplastic powder, piles up layer upon layer and realizes the shaping.
(4) The TPU powder adopted by the 3D printing bottle body structure is powder with the grain size of hundred microns, and the sintering and forming temperature of the thermoplastic material is 120 ℃.
(5) And taking the product out of the printer, and removing powder on the surface of the product.
(6) The chain that prints the inside an organic whole of bottle slowly stimulates, draws loose the inside powder that condenses into the fritter because of high temperature of bottle, and the clearance is simultaneously stimulateeed chain structure, clears out inside remaining powder entirely.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.
Claims (9)
1. A3D printing powder cleaning method is characterized in that: when SLS prints the product, set up a chain at least inside the product, pull the chain and make the inside powder of product become flexible during the clear powder.
2. A method of dusting as claimed in claim 1, characterized in that: the chain is printed at the same time that the SLS prints the product.
3. A method of removing dust from a meal as claimed in claim 2, wherein: the chain is not connected with the product.
4. A method of removing dust from a meal as claimed in claim 2, wherein: the product has a cavity therein, with at least one opening in the cavity.
5. A method of dusting as claimed in claim 4, characterized in that: at least one end of the chain is exposed out of the opening.
6. A method of dusting as claimed in any of the claims 1 to 5, characterized in that: the chain is obtained by connecting continuous chain units, and the adjacent chain units are in point connection, line connection or surface connection.
7. A method of dusting as claimed in claim 6, characterized in that: the chain unit is a regular octahedron framework, eight surfaces are congruent regular triangles, and adjacent regular octahedron frameworks are connected in a point mode.
8. A method of dusting as claimed in claim 6, characterized in that: the chain unit is a rhombic dodecahedron, twelve surfaces are congruent rhombuses, and adjacent rhombic dodecahedrons are connected in a surface mode.
9. A method of dusting as claimed in claim 6, characterized in that: when the chain is pulled to clean the powder, the air gun is combined to blow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011489849.1A CN112848285A (en) | 2020-12-16 | 2020-12-16 | 3D printing powder cleaning chain and powder cleaning method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011489849.1A CN112848285A (en) | 2020-12-16 | 2020-12-16 | 3D printing powder cleaning chain and powder cleaning method |
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| CN112848285A true CN112848285A (en) | 2021-05-28 |
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| CN202011489849.1A Pending CN112848285A (en) | 2020-12-16 | 2020-12-16 | 3D printing powder cleaning chain and powder cleaning method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105798304A (en) * | 2015-01-15 | 2016-07-27 | 空中客车德国运营有限责任公司 | Stiffening component and method for manufacturing a stiffening component |
| CN110435143A (en) * | 2019-09-02 | 2019-11-12 | 广东省新材料研究所 | A kind of 3D printing porous support structure |
| CN210651915U (en) * | 2018-09-21 | 2020-06-02 | 清锋（北京）科技有限公司 | 3D prints support piece and 3D and prints piece |
-
2020
- 2020-12-16 CN CN202011489849.1A patent/CN112848285A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105798304A (en) * | 2015-01-15 | 2016-07-27 | 空中客车德国运营有限责任公司 | Stiffening component and method for manufacturing a stiffening component |
| CN210651915U (en) * | 2018-09-21 | 2020-06-02 | 清锋（北京）科技有限公司 | 3D prints support piece and 3D and prints piece |
| CN110435143A (en) * | 2019-09-02 | 2019-11-12 | 广东省新材料研究所 | A kind of 3D printing porous support structure |
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Application publication date: 20210528 |
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